diff --git a/src/matrix/net/common.js b/src/matrix/net/common.ts
similarity index 90%
rename from src/matrix/net/common.js
rename to src/matrix/net/common.ts
index 889042ae..1f0a9f69 100644
--- a/src/matrix/net/common.js
+++ b/src/matrix/net/common.ts
@@ -15,6 +15,14 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+import type {BlobHandle} from "../../platform/web/dom/BlobHandle.js";
+
+export interface BlobBody {
+    mimeType: string;
+    body: BlobHandle;
+    length: number;
+}
+
 export function encodeQueryParams(queryParams) {
     return Object.entries(queryParams || {})
         .filter(([, value]) => value !== undefined)
diff --git a/src/platform/types/Platform.ts b/src/platform/types/Platform.ts
index ac125e2c..fce55f81 100644
--- a/src/platform/types/Platform.ts
+++ b/src/platform/types/Platform.ts
@@ -15,14 +15,7 @@ limitations under the License.
 */
 
 import type {RequestResult} from "../web/dom/request/fetch.js";
-import type {BlobHandle} from "../web/dom/BlobHandle.js";
-
-//ts-todo: This should go somewhere else?
-interface BlobBody {
-    mimeType: string;
-    body: BlobHandle;
-    length: number;
-}
+import type {BlobBody} from "../../matrix/net/common";
 
 interface IRequestOptions {
     uploadProgress?: (loadedBytes: number) => void;